Island



(Model.)

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BURGLAR ALARM. ria-329,253.

v Attorney.:

Patented Oct. 27, 1885.

UNITED STATES PATENT OFFICE CYRUS P. BAGHELDER, OF PAWTUCKET, RHODEISLAND.

BURGLAR-ALARNI.

SPECIFICATION forming part of Letters Patent No. 329,253, dated October27,1885.

' Application niet May 1, 1354. serial No. 130,683. (Model.)

To all whom it may concern.- Be it known that I, GYEUs P. BACHELDEE,

- a citizen of the United States, residing in the town of Pawtucket, inProvidence county, of the State of Rhode Island, have invented a new anduseful Improvement in Burglar- Alarms, of which the following is aspecification. l y

My invention relates to improvements in burglar-alarms adapted to beattached to the inside of the door or located within a room, and soconnected with the knobspindle of the door that upon said spindle beingturned a bell is rung, the object being to provide a catch which can beso fixed as to allow the bell to ring whenever the knob-spindle isturned; to provide improved means whereby said knob may be turnedwithout ringing the bell; and. further, to provide means Which,whcnplaced in a certain position, will allow the bell to ring continuously,when the knob is turned, until the force of the actuating-power is eX-pended.

With these ends in View the invention consists in the improvedconstruction and combination of parts hereinafter fully described, andpointed out in the claims.

In the drawings, Figure l is an elevation of a sufficient portion of adoor to illustrate the application of my invention thereto. Fig. 2 is alongitudinal vertical section of the device. Fig. 3 is a transversevertical section. Fig. 4 is a side elevation, and Fig. 5 is a detailview of the yoke or clamp employed for attaching or connecting the alarmwith the knob-spindle. Fig. 6 is a detached perspective view of thecasing.

In the accompanying drawings, in which like letters of referenceindicate corresponding parts in all the figures, A represents a suitablebracket or casing, at the upper end of which is journaled a gear-wheel,B, the shaft a of which is squared at its end to receive a key forturning said shaft, for a purpose which will 45 be explained. Connectedwith the shaft a is one end of a coilspring, C, which is wound aroundsaid shaft and connected with the bracket or casing at its other end. Onthe shaft a is located a sleeve or tube, b, through 5o which extends thesquared end of the said shaft. The said tube or sleeve is interiorlyvtends through an opening in the front of the threaded, and fitting uponthe same is a bell,

c, which is held in place by a nut, d, open at its end, to allow theinsertion of akey for winding the spring. Y On the casing is rigidlymounted upon a shaft, e, a gear-wheel, D, which meshes with thegear-Wheel B. In the sides of the casing, just below the gear-wheel D,is mounted a shaft, C', having near its inner end alantern-wheel, g,which lantern-wheel 6o meshes with the gear wheel D. It will thus b'eseen that if said coilspring is wound up f it will impart motion to thegear-wheel B, whichv will, through the medium of the gearwheel D, impartmotion to the lantern-'wheel g and the shaft C. Upon the shaft C isrigidly mounted a spur-wheel, E, which has upon its front face twooutwardly-,extending pins, t', located diametrically opposite one an- 7oF/ represents a shaft, which is mounted in the sides of the casing, justbelow the shaft C. Upon said shaft is mounted a pallet, j, which engagesthe spur or escape wheel E, one tooth at a time. It will thus be seenthat an oscillating isochronous movement will beimparted y to said shaftand pallet. Extending outwardly from the shaft E is a rod, k, having aknob or hammer at its end. Said hammer and rod are so located that whenthe shaft E is oscil- 8o lated they will be vibrated and the bell rung.E2 represents an arm, whichv is secured by its lower end to the shaftE', said arm being bent at right angles to its body portion, as shown atZ. The bent end of said arm eX- casing, and ts an aperture or openinginv a shifting lever, G, which lever G is pivoted at its upper end tothefront of the casing. The lower of said shifting-lever is bentinwardly 9o and then continued downwardly on aparallel line with theupper end of the said lever, but on a different plane. By shifting saidlever one ofthe teeth of the pallet is held rigidly in engagement withthe teeth of the escape 95 wheel, and prevents the same from turning.

H represents a pivoted stop, which consists of a strip of metalsubstantially L shape in form, having its free end turned inward, saidfree end being adapted to bear against one' of 100 the pins t', locatedadjacentthereto. A spring, m, is attached to the said stop at one endand to the door or other object to which the alarm may be attached atits other end, thus holding said stop in place.

Irepresents a wire, which is attached to the Stop at its upper end, thelower end of said wire being connected with chains o, which are attachedto the clamp or yoke upon the knobspindle on opposite sides of thevertical center of the saine, so that when said knobspindle is turnedthe stop through the connecting means described will be lowered andrelease the pin t'.

The operation is a follows: rlhe spring is wound by turning the shafta', and the gearing prevented from turning by the pivotedspring-actuated stop H, engaging one of the outwardly-extending pins ofthe eseapementwheel. Then the knob is turned in either direction, thesaid spring actuated stop is moved from engagement with said pin, andthe gearing is set in motion by the force of the spring,thus impartingmovement to the palletshaft and pallet, thereby causing the bell to berung by the hammer connected with said pallet-shaft until the oppositepin of the escapement-wheel comes into engagement with the stop H. rlhisis caused by the knob being released; but should the knob be held in aturned position the alarm will be :rung until the force of theactuating-power is expended. For allowing the knob to be turned withoutringing the alarm, the end `oi' the shifting lever which works in avertical slot, a, in the cover p is depressed and moved into a seat, q,of said cover.

rlhis movement of the shifting lever causes the same to come in contactwith the arm E2 on the pallet-shaft, and thereby holds one of the teethof the pallet in engagement with the escapement-wheel, and prevent-s thesame from being turned. It will thus be seen tnat when the knob isturned it will have no other effect upon the alarm than to remove thestop H from engagement with the pin of the escapement-wheel; but as saidwheel is locked by the pallet it will be seen that as soon as the knobis released said stop will be forced into engagement with said pin bymeans of the spiral spring. To allow the alarm to ring continuously,when the knob is turned, until the force of the actuating-spring isexpended, I provide a wire arm, K, having ashoulder, r, formed bybending said arm, said shoulder being located just below the upper faceof the pivoted stop H, said arm being pivoted at its upper end, itslower end extending downwardly through a slot or opening in the cover,which slot or opening is cut away to form a shoulder, s. Vhen it isdesired that the alarm shall ring continuously, the arm is depressed andmoved into the recessed portion of the slot, and bears against theshoulder. As soon as the knob is turned, it lowers the pivotedspring-actuated stop, which is engaged by the shoulder on thespring-arm, which holds the said lstop from engagement with the pins ofthe escapementwheel, thus allowing said wheel to turn until the springis run down.

It will be seen from the above description that by the use of myimprovement the alarm may be so arranged that the door can be openedwithout operating the same; that the alarm can be so adjusted that itwill ringv while the escapement-wheel is making onehalf of onerevolution, or that the bell may be allowed to ring continuously untilthe force of the spring-actuating power is expended.

The alarm above described is simple in its construction, easily applied,effective in its operation, and can be supplied at a comparativelyslight cost.

Having fully described my invention, what I claim as new, and desire tosecure by Letters l. In aburglar-alarm,thecombination,with aspring-actuated train of gearing, of a shaft, having an eseapement-wheelmounted thereon, apallet to engage said escapement-wheel,outwardlyextending pins on the esca-pementwheel, a pivotedspring-actuated stop, and a pivoted shouldered arm for engaging saidstop, substantially as set forth.

2. In a burglar-alarm, the combination, with a spring-actuated train ofgearing, of a shaft carrying an escapement-wheel, a shaft carrying apallet to engage the eseapement-wheel, an angular arm projecting fromthe palletshaft, and a shifting lever to engage said angular arm,whereby the alarm may be rendered inoperative, substantially as setforth.

CYRUS l?. BACH ELDER.

